BRIEF OHNE UMSCHLAG Haeckel, Karl; Sethe, Wilhelmine Author: Haeckel, Karl; Sethe, Wilhelmine Recipient: Haeckel, Ernst Dating: 01.03.1859
BRIEF OHNE UMSCHLAG Haeckel, Karl Author: Haeckel, Karl Recipient: Haeckel, Carl Gottlob Dating: 29.07.1859
BRIEF OHNE UMSCHLAG Haeckel, Hermine Author: Haeckel, Hermine Recipient: Haeckel, Carl Gottlob Dating: 26.08.1859